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Comparative transcriptomic and phenotypic analysis of induced pluripotent stem cell hepatocyte-like cells and primary human hepatocytes

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Abstract

Primary human hepatocytes (PHHs) are used extensively for in vitro liver cultures to study hepatic functions. However, limited availability and invasive retrieval prevent their widespread use. Induced pluripotent stem cells exhibit significant potential since they can be obtained non-invasively and differentiated into hepatic lineages, such as hepatocyte-like cells (iHLCs). However, there are concerns about their fetal phenotypic characteristics and their hepatic functions compared to PHHs in culture. Therefore, we performed an RNA-sequencing (RNA-seq) analysis to understand pathways that are either up- or downregulated in each cell type. Analysis of the RNA-seq data showed an upregulation in the bile secretion pathway where genes such as AQP9 and UGT1A1 were higher expressed in PHHs compared to iHLCs by 455- and 15-fold, respectively. Upon immunostaining, bile canaliculi were shown to be present in PHHs. The TCA cycle in PHHs was upregulated compared to iHLCs. Cellular analysis showed a 2–2.5-fold increase in normalized urea production in PHHs compared to iHLCs. In addition, drug metabolism pathways, including cytochrome P450 (CYP450) and UDP-glucuronosyltransferase enzymes, were upregulated in PHHs compared to iHLCs. Of note, CYP2E1 gene expression was significantly higher (21,810-fold) in PHHs. Acetaminophen and ethanol were administered to PHH and iHLC cultures to investigate differences in biotransformation. CYP450 activity of baseline and toxicant-treated samples was significantly higher in PHHs compared to iHLCs. Our analysis revealed that iHLCs have substantial differences from PHHs in critical hepatic functions. These results have highlighted the differences in gene expression and hepatic functions between PHHs and iHLCs to motivate future investigation.

Graphical Abstract

Characterizing the transcriptomic differences between primary human hepatocytes (PHHs) and induced pluripotent stem cell hepatocyte-like cells (iHLCs) using RNA-sequencing and phenotypic measurements

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Availability of data and materials

We will make the RNA-seq data available in the Gene Expression Omnibus upon publication. All experimental supplies were obtained from commercial vendors.

Abbreviations

HFC:

7-Hydroxy-4-trifluoromethylcoumarin

MFC:

7-Methoxy-4-trifluoromethylcoumarin

APAP:

Acetaminophen

AQP9:

Aquaporin 9

ABC:

ATP binding cassette

BMP-4:

Bone morphogenic factor-4

BSA:

Bovine serum albumin

CS:

Collagen sandwich

CYP450:

Cytochrome P450

ESCs:

Embryonic stem cells

ER:

Endoplasmic reticulum

EtOH:

Ethanol

EDTA:

Ethylenediaminetetraacetic acid

FXR:

Farnesoid X receptor

FGF-2:

Fibroblast growth factor-2

GSH:

Glutathione

HGF:

Hepatocyte growth factor

iHLCs:

Hepatocyte-like cells

iPSCs:

Induced pluripotent stem cells

LC50 :

Lethal concentration 50

LSECs:

Liver sinusoidal endothelial cells

mTOR:

Mammalian target of rapamycin

NPCs:

Non-parenchymal cells

OGDHL:

Oxoglutarate dehydrogenase L

PBS:

Phosphate buffered saline

PCA:

Principal component analyses

PCK1:

Phosphoenolpyruvate carboxykinase 1

PI3K:

Phosphoinositide 3-kinase

PHHs:

Primary human hepatocytes

AKT:

Protein kinase B

ROS:

Reactive oxygen species

SDS:

Sodium dodecyl sulfate

TCPS:

Tissue culture polystyrene

t-SNE:

T-distributed stochastic neighbor embedding

UGT:

UDP-glucuronosyltransferase

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Acknowledgements

Figures 1, 4c/d, and 5a/f were created using Biorender.com.

Funding

The authors gratefully acknowledge support for this work from the National Science Foundation (NSF DBI-1759858, T.M.M., K.A., and Y.S.; DBI-2233967, T.M.M. and Y.S.; NSF 2200045, T.M.M. and P.R.), Institute for Critical Technologies and Applied Science, Virginia Tech (P.R. and N.G.), and the Computational Tissue Engineering Interdisciplinary Graduate Education Program, Virginia Tech (T.M.M. and P.R.).

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Authors

Contributions

N.G. performed statistical analysis, interpreted the data, and wrote the manuscript. L.W. performed the cellular work and assessments. K.A. performed the RNA-seq analysis and interpreted the results. Y.S. assisted with revisions and analyzing the RNA-seq data. P.N. assisted with revisions to the manuscript. T.M.M. and P.R. designed the scope of the paper, supervised, and wrote the paper.

Corresponding author

Correspondence to Padmavathy Rajagopalan.

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The authors declare no competing interests.

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Gandhi, N., Wills, L., Akers, K. et al. Comparative transcriptomic and phenotypic analysis of induced pluripotent stem cell hepatocyte-like cells and primary human hepatocytes. Cell Tissue Res 396, 119–139 (2024). https://doi.org/10.1007/s00441-024-03868-9

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  • DOI: https://doi.org/10.1007/s00441-024-03868-9

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